11.1 Flashcards
Thermochemistry
thermochemistry is the study of energy changes in a chemical system, during a chemical reaction.
Thermal Energy
the energy of motion of particles, or kinetic energy.
Exothermic and Endothermic
measurements of the temperatures of the surroundings used to classify change as….
Endothermic net enthalpy is…
positive (KJ)
Exothermic net enthalpy is…
Negative(KJ)
In an endothermic reaction, the energy to break a bond is (…..) than the energy released when bonds are formed.
GREATER
In an exothermic reaction, the energy to break a bond is (…..) then the energy released when bonds are formed.
LESS
Lower the heat capacity
the more drastic changes at lower temperature.
kinetic energy
energy of motion: thermal energy
∆H = mc∆t: Variables
∆H = the quantity of thermal energy or heat energy (J or KJ).
m = the mass of the substance (g or kg).
c = the specific heat capacity ((J/g°C) or (KJ/kg°C)).
∆t = the change in temperature (°C).
potential energy
energy due to position and bond energy.
Enthalpy
the chemical potential energy stored by a chemical system.
enthalpy change is represented by the variable..
∆H
enthalpy units is
KJ
enthalpy change
is the difference between the chemical potential energy of the products and the chemical potential energy of the reactants in a chemical reaction.
